feat: Implement a user-approved shell command execution tool and a Windows installer script.

AnchorCli.csproj

@@ -12,6 +12,12 @@
     <AssemblyName>anchor</AssemblyName>
   </PropertyGroup>
 
+  <PropertyGroup Condition="$([MSBuild]::IsOSPlatform('Windows'))">
+    <DefineConstants>$(DefineConstants);WINDOWS</DefineConstants>
+    <!-- Windows requires Desktop C++ Workload for NativeAOT, so we compile a standard self-contained portable executable instead -->
+    <PublishAot>false</PublishAot>
+  </PropertyGroup>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.AI" Version="10.3.0" />
     <PackageReference Include="Microsoft.Extensions.AI.OpenAI" Version="10.3.0" />

Program.cs

@@ -145,7 +145,7 @@ if (modelInfo != null)
 // ── Chat history with system prompt ─────────────────────────────────────
 List<ChatMessage> history =
 [
-    new(ChatRole.System, """
+    new(ChatRole.System, $$"""
         You are anchor, a coding assistant that edits files using the Hashline technique.
 
         ## Reading files
@@ -166,6 +166,7 @@ List<ChatMessage> history =
         4. If an anchor fails validation, re-read the file to get fresh anchors.
 
         Keep responses concise. You have access to the current working directory.
+        You are running on: {{System.Runtime.InteropServices.RuntimeInformation.OSDescription}}
     """)
 ];
 

Tools/CommandTool.cs

@@ -11,7 +11,11 @@ internal static class CommandTool
 {
     public static Action<string> Log { get; set; } = Console.WriteLine;
 
-    [Description("Execute a shell command after user approval. Prompts with [Y/n] before running. Note: For file editing and operations, use the built-in file tools (ReadFile, ReplaceLines, InsertAfter, DeleteRange, CreateFile, etc.) instead of shell commands.")]
+#if WINDOWS
+    [Description("Execute a PowerShell command after user approval. Prompts with [Y/n] before running. Note: For file editing and operations, use the built-in file tools (ReadFile, ReplaceLines, InsertAfter, DeleteRange, CreateFile, etc.) instead of shell commands.")]
+#else
+    [Description("Execute a Bash shell command after user approval. Prompts with [Y/n] before running. Note: For file editing and operations, use the built-in file tools (ReadFile, ReplaceLines, InsertAfter, DeleteRange, CreateFile, etc.) instead of shell commands.")]
+#endif
     public static string ExecuteCommand(
         [Description("The shell command to execute.")] string command)
     {
@@ -41,8 +45,13 @@ internal static class CommandTool
         {
             var startInfo = new ProcessStartInfo
             {
+#if WINDOWS
+                FileName = "powershell.exe",
+                Arguments = $"-NoProfile -Command \"{command}\"",
+#else
                 FileName = "/bin/bash",
                 Arguments = $"-c \"{command}\"",
+#endif
                 UseShellExecute = false,
                 RedirectStandardOutput = true,
                 RedirectStandardError = true,

installer.ps1

@@ -0,0 +1,39 @@
+$ErrorActionPreference = "Stop"
+
+Write-Host "Publishing project..."
+dotnet publish -c Release -r win-x64 -p:PublishSingleFile=true -o ./publish
+
+Write-Host "Finding binary..."
+$binary = Get-ChildItem -Path ./publish -Filter "anchor.exe" -File | Select-Object -First 1
+
+if (-not $binary) {
+    Write-Host "Error: Could not find anchor.exe in ./publish" -ForegroundColor Red
+    exit 1
+}
+
+Write-Host "Found binary: $($binary.FullName)"
+
+# Define the installation directory in the user's profile
+$installDir = Join-Path $env:USERPROFILE ".anchor\bin"
+
+if (-not (Test-Path $installDir)) {
+    Write-Host "Creating installation directory: $installDir"
+    New-Item -ItemType Directory -Path $installDir | Out-Null
+}
+
+Write-Host "Copying to $installDir..."
+Copy-Item -Path $binary.FullName -Destination $installDir -Force
+
+# Check if the installation directory is in the User PATH
+$userPath = [Environment]::GetEnvironmentVariable("PATH", "User")
+if ($userPath -split ';' -notcontains $installDir) {
+    Write-Host "Adding $installDir to User PATH..."
+    $newPath = if ($userPath) { "$userPath;$installDir" } else { $installDir }
+    [Environment]::SetEnvironmentVariable("PATH", $newPath, "User")
+    Write-Host "PATH updated. You may need to restart your terminal for changes to take effect." -ForegroundColor Yellow
+}
+else {
+    Write-Host "$installDir is already in the PATH."
+}
+
+Write-Host "Installation complete!" -ForegroundColor Green